Just browsing the news bumped into two unrelated stories today, from small town California to large.
Los Angeles is one of the biggest school districts in the country.
LAUSD Is Handing Out Rapid Tests For Baseline COVID Testing; The district requires all students and staff to have the negative COVID-19 test for a baseline in addition to weekly testing. - https://laist.com/news/education/lausd-is-handing-out-rapid-tests-for-baseline-testing-heres-where-to-go
Mendocino County schools ahead of the curve in distributing COVID tests - https://www.ukiahdailyjournal.com/2022/01/07/mendocino-county-schools-ahead-of-the-curve-in-distributing-covid-tests/
This was confirmed as how the major hospital system in my city was handling it on the numbers they were showing.
Have somebody admitted and you test them every day? That positive test adds to the total each day.
Not that I'm aware of, but that's what I figured.